题目

气相合成金刚石薄膜被誉为20世纪的炼金术。其中化学气相沉积法制造金刚石薄膜的原理为：CH4 →C(金刚石)+2H2。该反应所属的基本反应类型为A．化合反应B．分解反应C．置换反应D．氧化反应 答案：B解析:略     One stormy night many years ago, an elderly man and his wife entered the hall of a small hotel in Philadelphia. Trying to get out of the rain, they came the front desk hoping to get some shelter for the night.     "Could you possibly give us a room here?" the husband asked.     The clerk, a friendly man with a winning smile, looked at the couple and explained that there werethree conventions in town. "All of our rooms are taken," the clerk said. "But I can't send a nice couple like you out into the rain at one o'clock in the morning. Would you perhaps be willing to sleep in my room? It's not exactly a suite, but it will be good enough to make you folks comfortable for the night."     When the couple declined, the young man pressed on. "Don't worry about me; I'll make out just fine." the clerk told them.So the couple agreed.     As he paid his bill the next morning, the elderly man said to the clerk, "You are the kind of manager who should be the boss of the best hotel in the United States. Maybe someday I'll build one for you." The clerk looked at them and smiled. The three of them had a good laugh. As they drove away, the elderly couple agreed that the helpful clerk was indeed exceptional, as finding people who are both friendly and helpful isn't easy.     Two years passed. The clerk had almost forgotten the incident when he received a letter from the oldman. It recalled that stormy night and enclosed a roundtrip ticket to New York, asking the young man topay them a visit.     The old man met him in New York, and led him to the corner of Fifth Avenue and 34th street. Hethen pointed to a great new building there, a pale reddish stone, with turrets and watchtowers thrusting up to the sky. "That," said the older man, "is the hotel I have just built for you to manage." "You must be joking, " the young man said. "I can assure you I am not," said the older man, a sly smile playing around his mouth.     The older man's name was William Waldorf Astor, and that magnificent structure was the original WaldorfAstoria Hotel. The young clerk who became its first manager was George C. Boldt. This young clerk never foresaw the turn of events that would lead him to become the manager of one of the world'smost glamorous hotels.1. The purpose of the following author writing this story is to________.A. give people a good laughB. cover some factsC. promote the business of WaldorfAstoria HotelD. deliver a lesson 2. Which of the following statements about the story is NOT true ?A. The story took place at about one a. m..B. The old couple was too poor to afford a luxurious room.C. The clerk was willing to help those in need.D. The clerk received an unexpected invitation from the old man.3. The underlined word "conventions" in Para 3.can be replaced by________.A. rooms     B. suitesC. meetings     D. hotels4. Which of the following proverbs suits the story the best?A. Every little thing helps.B. Make hay while the sun shines.C. Man proposes; God disposes (处理, 决定). D. One good turn deserves another.